1 files changed, 178 insertions, 0 deletions
diff --git a/modules/libjar/zipwriter/nsDeflateConverter.cpp b/modules/libjar/zipwriter/nsDeflateConverter.cpp
new file mode 100644
index 0000000000..32dc3c7ebf
--- /dev/null
+++ b/modules/libjar/zipwriter/nsDeflateConverter.cpp
@@ -0,0 +1,178 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "StreamFunctions.h"
+#include "nsDeflateConverter.h"
+#include "nsStringStream.h"
+#include "nsComponentManagerUtils.h"
+#include "nsMemory.h"
+#include "plstr.h"
+#include "mozilla/UniquePtr.h"
+
+#define ZLIB_TYPE "deflate"
+#define GZIP_TYPE "gzip"
+#define X_GZIP_TYPE "x-gzip"
+
+using namespace mozilla;
+
+/**
+ * nsDeflateConverter is a stream converter applies the deflate compression
+ * method to the data.
+ */
+NS_IMPL_ISUPPORTS(nsDeflateConverter, nsIStreamConverter, nsIStreamListener,
+                  nsIRequestObserver)
+
+nsresult nsDeflateConverter::Init() {
+  int zerr;
+
+  mOffset = 0;
+
+  mZstream.zalloc = Z_NULL;
+  mZstream.zfree = Z_NULL;
+  mZstream.opaque = Z_NULL;
+
+  int32_t window = MAX_WBITS;
+  switch (mWrapMode) {
+    case WRAP_NONE:
+      window = -window;
+      break;
+    case WRAP_GZIP:
+      window += 16;
+      break;
+    default:
+      break;
+  }
+
+  zerr = deflateInit2(&mZstream, mLevel, Z_DEFLATED, window, 8,
+                      Z_DEFAULT_STRATEGY);
+  if (zerr != Z_OK) return NS_ERROR_OUT_OF_MEMORY;
+
+  mZstream.next_out = mWriteBuffer;
+  mZstream.avail_out = sizeof(mWriteBuffer);
+
+  // mark the input buffer as empty.
+  mZstream.avail_in = 0;
+  mZstream.next_in = Z_NULL;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsDeflateConverter::Convert(nsIInputStream* aFromStream,
+                                          const char* aFromType,
+                                          const char* aToType,
+                                          nsISupports* aCtxt,
+                                          nsIInputStream** _retval) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsDeflateConverter::AsyncConvertData(const char* aFromType,
+                                                   const char* aToType,
+                                                   nsIStreamListener* aListener,
+                                                   nsISupports* aCtxt) {
+  if (mListener) return NS_ERROR_ALREADY_INITIALIZED;
+
+  NS_ENSURE_ARG_POINTER(aListener);
+
+  if (!PL_strncasecmp(aToType, ZLIB_TYPE, sizeof(ZLIB_TYPE) - 1))
+    mWrapMode = WRAP_ZLIB;
+  else if (!PL_strcasecmp(aToType, GZIP_TYPE) ||
+           !PL_strcasecmp(aToType, X_GZIP_TYPE))
+    mWrapMode = WRAP_GZIP;
+  else
+    mWrapMode = WRAP_NONE;
+
+  nsresult rv = Init();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mListener = aListener;
+  mContext = aCtxt;
+  return rv;
+}
+
+NS_IMETHODIMP
+nsDeflateConverter::GetConvertedType(const nsACString& aFromType,
+                                     nsIChannel* aChannel,
+                                     nsACString& aToType) {
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsDeflateConverter::OnDataAvailable(nsIRequest* aRequest,
+                                                  nsIInputStream* aInputStream,
+                                                  uint64_t aOffset,
+                                                  uint32_t aCount) {
+  if (!mListener) return NS_ERROR_NOT_INITIALIZED;
+
+  auto buffer = MakeUnique<char[]>(aCount);
+  NS_ENSURE_TRUE(buffer, NS_ERROR_OUT_OF_MEMORY);
+
+  nsresult rv = ZW_ReadData(aInputStream, buffer.get(), aCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // make sure we aren't reading too much
+  mZstream.avail_in = aCount;
+  mZstream.next_in = (unsigned char*)buffer.get();
+
+  int zerr = Z_OK;
+  // deflate loop
+  while (mZstream.avail_in > 0 && zerr == Z_OK) {
+    zerr = deflate(&mZstream, Z_NO_FLUSH);
+
+    while (mZstream.avail_out == 0) {
+      // buffer is full, push the data out to the listener
+      rv = PushAvailableData(aRequest, nullptr);
+      NS_ENSURE_SUCCESS(rv, rv);
+      zerr = deflate(&mZstream, Z_NO_FLUSH);
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsDeflateConverter::OnStartRequest(nsIRequest* aRequest) {
+  if (!mListener) return NS_ERROR_NOT_INITIALIZED;
+
+  return mListener->OnStartRequest(aRequest);
+}
+
+NS_IMETHODIMP nsDeflateConverter::OnStopRequest(nsIRequest* aRequest,
+                                                nsresult aStatusCode) {
+  if (!mListener) return NS_ERROR_NOT_INITIALIZED;
+
+  nsresult rv;
+
+  int zerr;
+  do {
+    zerr = deflate(&mZstream, Z_FINISH);
+    rv = PushAvailableData(aRequest, nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+  } while (zerr == Z_OK);
+
+  deflateEnd(&mZstream);
+
+  return mListener->OnStopRequest(aRequest, aStatusCode);
+}
+
+nsresult nsDeflateConverter::PushAvailableData(nsIRequest* aRequest,
+                                               nsISupports* aContext) {
+  uint32_t bytesToWrite = sizeof(mWriteBuffer) - mZstream.avail_out;
+  // We don't need to do anything if there isn't any data
+  if (bytesToWrite == 0) return NS_OK;
+
+  MOZ_ASSERT(bytesToWrite <= INT32_MAX);
+  nsCOMPtr<nsIInputStream> stream;
+  nsresult rv = NS_NewByteInputStream(getter_AddRefs(stream),
+                                      Span((char*)mWriteBuffer, bytesToWrite),
+                                      NS_ASSIGNMENT_DEPEND);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = mListener->OnDataAvailable(aRequest, stream, mOffset, bytesToWrite);
+
+  // now set the state for 'deflate'
+  mZstream.next_out = mWriteBuffer;
+  mZstream.avail_out = sizeof(mWriteBuffer);
+
+  mOffset += bytesToWrite;
+  return rv;
+}